Unlockables
Difficulty Levels

Beating each difficulty mode will unlock the next. For example, beating Ouroboro Emulation mode will unlock Welcome to the Real World mode which continues the story which Ouroboro Emulation mode left off.
Unlockable              How to Unlock
Hard mode               Clear Normal mode
Normal mode             Clear Easy mode


Secrets
New Storyline

After beating the game, start a new game+, there will be a new storyline on that playthrough.